Five layers of PM2.5 Carbon filtering,Made of activated carbon and non-woven filter cloth, to effectively keep away a range of airborne contaminants.

Filter size measures approx. 4.72 x 3.15 inches, easy to insert or replace the original one.

Protects against most airborne particles like dust, seasonal allergies, gardening pollen and so on, suitable for most occasions.

Note: Filter insert can not be cleaned and should be replaced everyday for getting best protection.